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November 4, 2026
Technical System Designer
Mid • On-site
Warsaw, Poland
Quick Facts
Role: Technical System Designer
Description
Translate requirements and acceptance criteria into technical designs that define system behavior, data flows, inter-system contracts, component responsibilities, and error handling. Analyze existing code and application behavior to validate solutions, collaborate with analysts/architects/developers during implementation, and troubleshoot performance issues with optimization recommendations. Use AI tools to analyze, design, and document changes while critically verifying outputs, and strengthen security through secure-by-design solutions.
Responsibilities
Convert requirements into technical designs (behavior, data flows, contracts, responsibilities, error handling)
Review existing code and application behavior to validate proposed solutions
Collaborate with business analysts, solution architects, developers, and application administrators; support implementation
Perform targeted performance analysis of applications and IT infrastructure; identify root causes and recommend optimizations
Evaluate new technologies and IT tools and contribute to adoption decisions
Design secure solutions by identifying risks and coordinating with relevant teams
Use AI tools for analysis, design, and documentation; verify AI outputs
Coordinate with other departments on technology needs and change scope
Work in an Agile team, solve technical problems, and continuously improve ways of working
Document design decisions and communicate change scope, risks, and solution quality to stakeholders
Contribute to system development strategy by identifying architectural needs and proposing directions for change
Requirements
3+ years of experience in technical design of IT systems or significant architectural changes
2+ years of hands-on commercial software development; able to read code and trace actual request flow through the system
Ability to translate acceptance criteria into feasible technical design aligned with system architecture
Experience analyzing existing code and designing extensions to established mechanisms
Practical knowledge of frontend and backend web application architecture, including data flows, REST/JSON contract design, and integrations
Ability to design flexible, configurable solutions and assess impact on related processes
Experience diagnosing technical and performance issues and recommending optimizations for applications and infrastructure
Knowledge of authentication, authorization, and data protection principles
Hands-on experience using AI tools for code analysis/design/implementation/testing/documentation with critical evaluation of outputs
Ability to document technical decisions clearly and collaborate with cross-functional stakeholders
Benefits
Medical care, sports packages, parking, and a special mobile plan
Benefits platform with options to support body, mind, and soul
Extra day off for your birthday or name day
Referral program to invite friends and earn a bonus
Participation in social initiatives and recognized CSR programs
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